$ git clone -n https://src.fedoraproject.org/rpms/mingw-libxml2.git /var/lib/mock/f40-build-2211690-52225/root/chroot_tmpdir/scmroot/mingw-libxml2
Cloning into '/var/lib/mock/f40-build-2211690-52225/root/chroot_tmpdir/scmroot/mingw-libxml2'...
$ git fetch origin e3487c815d10442ab4c021c835e23e1f09475208:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-libxml2
 * [new ref]         e3487c815d10442ab4c021c835e23e1f09475208 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3487c8 Update to 2.12.3